An analysis of the distributions of electronic states associated with hydrogenated amorphous silicon

Malik, Saad M.; O’Leary, Stephen K.

doi:10.1007/s10854-005-6598-1

Cited by 12 publications

(1 citation statement)

References 24 publications

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“…Through a fit with the PECVD a-Si: H joint density-of-states ͑JDOS͒ experimental results of Jackson et al, 16 O'Leary 17 found that N vo = 2.38 ϫ 10 22 cm −3 eV −3/2 , N co = 2.38ϫ 10 22 cm −3 eV −3/2 , Table I, for the purposes of this analysis, noting that other selections for the PECVD a-Si: H DOS modeling parameters could have been made. [25][26][27] The resultant valence-band and conduction-band DOS functions, corresponding to this particular selection of DOS modeling parameters, are depicted in Fig. 1͑a͒.…”

Section: Modeling the Optical-absorption Spectrum Associated Witmentioning

confidence: 99%

The dependence of the Tauc and Cody optical gaps associated with hydrogenated amorphous silicon on the film thickness: αl Experimental limitations and the impact of curvature in the Tauc and Cody plots

Mok

O’Leary

2007

Journal of Applied Physics

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Using a model for the optical spectrum associated with hydrogenated amorphous silicon, explicitly taking into account fundamental experimental limitations encountered, we theoretically determine the dependence of the Tauc and Cody optical gaps associated with hydrogenated amorphous silicon on the thickness of the film. We compare these results with that obtained from experiment. We find that the curvature in the Tauc plot plays a significant role in influencing the determination of the Tauc optical gap associated with hydrogenated amorphous silicon, thus affirming an earlier hypothesis of Cody et al. We also find that the spectral dependence of the refractive index plays an important role in influencing the determination of the Cody optical gap. It is thus clear that care must be exercised when drawing conclusions from the dependence of the Tauc and Cody optical gaps associated with hydrogenated amorphous silicon on the thickness of the film.

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Section: Modeling the Optical-absorption Spectrum Associated Witmentioning

confidence: 99%